Parameters Affecting Helicopter Interactional Aerodynamics in Ground Effect
Authors: Hanker, Edward J.; Smith, Robert P.
Source: Journal of the American Helicopter Society, Volume 30, Number 1, 1 January 1985 , pp. 52-61(10)
Publisher: AHS International
Abstract:In the last decade, Army helicopter operational experience has shown that aerodynamic interaction of the primary flow components significantly affects helicopter handling qualities. An experimental investigation was conducted during August, 1981 in the Boeing Vertol 20‐ft by 20‐ft V/STOL wind tunnel to develop further insights into the parameters that affect helicopter interactional aerodynamics in ground effect. Changes in aircraft forces and moments due to variations in main rotor thrust, tall rotor thrust, wind magnitude and direction are presented for a 1:4.85 scale model of the YUH‐61A. Additional studies include the effects of varying fin size and tail rotor blockage ratio on main rotor/tail rotor/empennage interactions. All tests were conducted at airspeeds representative of Nap‐of‐the‐Earth (NOE) flight, i.e., below 45 knots.
Document Type: Research Article
Affiliations: Flying Qualities, Boeing Vertol Company, Philadelphia, PA
Publication date: 1985-01-01
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